吐哈探区稠油油藏注气吞吐适应性评价

doi:10.7657/XJPG20230311

摘要/Abstract

摘要：

针对吐哈探区稠油油藏注气吞吐效果差的问题，利用PVT分析技术模拟稠油油藏的高温高压环境进行注气吞吐实验，通过稠油油藏注二氧化碳、天然气和氮气吞吐开发实验，从降黏效果、溶解膨胀作用、泡沫油流区间以及吞吐后残留稠油物性特征4个方面，对不同注入气进行适应性评价。结果表明，注二氧化碳吞吐对稠油降黏、溶解膨胀和形成泡沫油流区间的效果最佳，但吞吐后对油藏残留稠油物性特征影响大，主要表现在吞吐后导致油藏残留稠油黏度增大和溶解气的能力下降，不利于油藏进行多轮次注气吞吐开发；注天然气吞吐的效果及影响略次于注二氧化碳，注氮气吞吐的效果最差，但吞吐后对油藏残留稠油物性特征影响小。

关键词: 吐哈探区, 稠油油藏, 注气吞吐, 降黏效果, 溶解膨胀作用, 泡沫油, 适应性评价

Abstract:

The performance of gas huff-n-puff in heavy oil reservoirs in the Tuha exploration area are declining. Gas huff-n-puff experiments were conducted by using PVT analysis technology to simulate high-temperature and high-pressure environment in the heavy oil reservoirs. CO₂, natural gas, and nitrogen were injected respectively into the reservoirs, and then evaluated for adaptability in terms of viscosity reduction, swelling effect, foamy oil range, and residual heavy oil properties. The results show that CO₂ huff-n-puff is best performed in viscosity reduction, swelling, and foamy oil range, but the injected CO₂ has a significant impact on the residual heavy oil properties by increasing the residual heavy oil viscosity and decreasing the gas dissolution capacity, which is not conducive to multiple rounds of gas huff-n-puff. The natural gas huff-n-puff effect is slightly inferior to that of CO₂ huff-n-puff, while the nitrogen huff-n-puff exhibits the worst performance but has a little impact on residual heavy oil properties.

Key words: Tuha exploration area, heavy oil reservoir, gas huff-n-puff, viscosity reduction, swelling, foamy oil, adaptability evaluation

中图分类号:

TE345

夏正春, 赵健, 刘锋, 秦恩鹏, 蔡必金, 王奇. 吐哈探区稠油油藏注气吞吐适应性评价[J]. 新疆石油地质, 2023, 44(3): 341-346.

XIA Zhengchun, ZHAO Jian, LIU Feng, QIN Enpeng, CAI Bijin, WANG Qi. Adaptability Evaluation of Gas Huff-n-Puff in Heavy Oil Reservoirs in Tuha Exploration Area[J]. Xinjiang Petroleum Geology, 2023, 44(3): 341-346.

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